Hoisting mechanism



F. J. SCHUMAN AND B, S. ROTHWELL.

HOISTING MECHANISM.

APPLICATION FILED IuNE I0. 1920.

mma M3117, 1922. i

UNITED STATES PATENT oFFlcr..

FRANK J'. SGHUMAN, 0F CLEVELAND HEIGHTS, AND BERTRAM S. ROTHWELL, 07F CLEVELAND, OHIO, ASSIGNORS T0 THE INTERSTATE FOUNDRY COMPANY, OF CLEVELAND, OHIO, CORPORATON 0F OHIO.

HOISTING MECH'AN ISM.

Specicaton of Letters Patent.

Patented Mar. 7, 1922.

Application filed .Tune 10, 1920 Serial No. 387,876.

To all whom t may concern:

Be it known that we, FRANK J. SCHUMAN and BERTRAM S. Rori-rwnLL, both citizens of the United States, and residents of Cleveland Heights, county of Cuyahoga, and State of Ohio, and Cleveland, county of Cuyahoga, and State of Chio, respectively, have jointly invented a new and useful lmprovement in Hoisting Mechanism, of which the following is a specification, the principle of the invention being herein explained, and the best mode in which we have contemplated applying that principle, so as to distinguish it from other inventions.

The present invention, relating, as indicated, to a hoisting mechanism, is more particularly directed to a small hoist to be operated by hand for picking up such articles as castings, pieces of machinery and articles in process of manufacture for transportation about a' shop. ln such mechanism it is highly desirable that the hoist be of such construction that a single operator can not only manually lift the article to be transported, but can at the same time guide this article both when being lifted and lowered. At the same time such a mechanism should be extremely simple in its operation, as it must be handled by unskilled men and must be inexpensive in its construction. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing z-f Fig. 1 is a front elevation of our improved hoist showing the same supported over a suitable track or trolley; Fig. 2 is a side elevation of the same; and Fig. 3 is a section on the line 33, in Fig. 2.

Referring now to Figs. 1 and 2, there is shown a track 1, upon which is mounted a trolley or carriage 2, from which is supported a framework 3 of the hoist.' The hoist proper consists of a winding drum 4, upon which may be wound a cable or chain 5, from which any desired type of grappling hooks G may depend. This winding drum 4 is driven through a gear 7 mounted on a drum, from a gear 8 carried on a shaft 9 parallel with the drum. TheA latter shaft also carries a. gear 10 operated by means of the gear 11 on the third parallel shaft 12, which is operated by means of a large hand wheel 13. These driving connections constitute a train of reducing gearing which, when taken with the large hand wheel, affords a considerable brake* on the operation of the winding drum 4 and makes it relatively easy either to hold this drum stationary when under load, or to wind in on the cable, or allow it to be lowered at any speed desired. The braking action of such train of gearing is of course insufficient to `assist materially in holding any great weight but is enough to allow of very' convenient control of such weights as require to be moved around under most conditions, and is sufficientV for weights of several hundred pounds.

Mounted on the frame 3 is a pawl 14 adapted to engage in the teeth of the gear 7 to lock the same and the entire train of gearing against movement. In order to prevent jumping of the cable 5 a guard 15 is provided, extending from side to side of the frame 3 in the position shown in Figs. 1 and 3.

ln operation the hoist is moved along the trackway 1 until it is at the point of operation when the pawl 14 is disengaged and the cable 5 is run out until the hook 6 may be connected with the casting or other article to be lifted. The article is then lifted by winding in the cable by means of the hand wheel 13. The hand wheel is a large wheel, giving a considerable leverage, while the train of gears 11, 10, 8 and 7 additionally increase the winding effect and make it possible for the operator to hoist the article by operating the hand wheel with a single hand. While doing this he can guide the article being lifted, or steady the hoist if necessary with the other hand, and when the article is at the desired height the pawl 14 may be engaged with the gear 7 and the mechanism locked. When lowering an article the pawl 14 may be disengaged and the operator can then control the lowering of the article and the unwinding of the cable with one hand on the wheel 13, the other hand beingused to pull the hoist to the exact position or to steady or turn the article as it is lowered into place.

The advantages of the present mechanism are its extreme simplicity :izonstruction andthe fact that it can he readily perated, either for hoisting` or lowering, by one man with one hand, which allows the other hand to be used in guiding thearticle in place.

Other modes of applying the principle of our invention may he employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of suc-h stated means be employed` 7e therefore particularly point out and distinctly claim as our invention 1. In a hoisting mechanism, the combination of a carriage adapted to he supported from an overhead trackway, an open framework swingingly suspended from said carriage, a series of shafts journaled transversely in said framework and provided with interengaging gear wheels, a drum and hoist line mounted on one of said shafts, an operating wheel mounted upon another of said shafts outside of said framework, a pawl pivotally mounted upon said framework and adapted to engage the gear wheel adjacent said drum to hold the load in hoisted position, an operating handle connected with said pawl and extending to a position adj a-` cent said operating wheel, and a guard rod mounted on said frame adjacent the running position of said hoist line for preventing jumping of the same. Y

In a hoisting mechanism, the combination of a carriage adapted to he supported from an overhead traclrway, an open frameworlr swingingly suspended from said carriage and carrying the usual hoist line and grapple, a series of three shafts journaled tansversely adjacent the lower end of said framework.` a gear wheel mounted upon the upper shaft adjacent one side of the frame and formingr one flange of a drum for said hoist line, a plain disk formingl the other flange of said drum and spaced from the other side of the framework, a pair of gear wheels fixed adjacent the opposite ends of the intermediate shaft, the smaller of said gears engaging the gear on the uppermost shaft and the opposite gear extending into said space between the drum and the frame-- work, a gear mounted on the lower shaft ad- `iacent one side of the framework and engaging the large gear on the intermediate shaft and a handwheel within easyv reach of the operators position for controlling the motionof the drum through the train of reduction gears, mounted on the outer end of said lower shaft.

Signed at Cleveland, Ohio, tl is 6th da",7 of June, 1920. l

FRANK J. SCllUli/IAN. BERTRAM S. ROTHVELL. 

